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http://dx.doi.org/10.7464/ksct.2014.20.1.022

Enthalpy Changes of Adsorption of Tetrafluorocarbon (CF4) and Hexafluoroethane (C2F6) on Activated Carbon  

Shin, Jiyoung (Department of Chemical Engineering, Hongik University)
Suh, Sung-Sup (Department of Chemical Engineering, Hongik University)
Choi, Moon Kyu (Department of Chemical Engineering, Hongik University)
Publication Information
Clean Technology / v.20, no.1, 2014 , pp. 22-27 More about this Journal
Abstract
Under low pressures of $CF_4$ and $C_2F_6$ up to 20.7 kPa, the equilibrium adsorbed quantity on activated carbon was experimentally examined using the volumetric method at various temperatures between 293.15 K and 333.15 K. To give the best fit to the experimental data curve, the two step model (i.e., Langmuir model for the first layer adsorption and then Freundlich physisorption) is suggested. The method of initial slope yielded the enthalpy of adsorption for the first step while we could apply the Clausius-Clapeyron equation to find the heat of adsorption of the second step. They are 25.9 kJ/mol and 11.8 kJ/mol, respectively, with $CF_4$, and 38.7 and 38.2 kJ/mol with $C_2F_6$.
Keywords
Enthalpy change of adsorption; Tetrafluorocarbon; Hexafluorocarbonethane; PFC;
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